Genetic Code - GCSE Biology Definition

The genetic code is like a set of instructions inside our cells that tells them how to make proteins, which are important for building and maintaining our body. It is written in the DNA, using sequences of four chemical letters called bases: A, T, C, and G. These bases are read in groups of three, called codons, and each codon tells the cell to add a specific amino acid to a growing protein chain. Just like how different arrangements of letters make different words, different sequences of codons make different proteins. The genetic code is universal, meaning it works the same way in almost all living things, from tiny bacteria to big animals like elephants.